<template>
<div>
  <!--面包屑导航-->
  <el-breadcrumb separator="/">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item><a href="/rights">商品管理</a></el-breadcrumb-item>
    <el-breadcrumb-item>参数列表</el-breadcrumb-item>
  </el-breadcrumb>

  <!--卡片视图-->
  <el-card>
    <!--头部警告区域-->
    <el-alert :closable="false" show-icon title="注意:只允许为第三级分类设置相关参数！" type="warning">
    </el-alert>

    <!--选择商品分类区域-->
    <el-row class="cat_opt">
      <el-col>
        <span>选择商品分类:</span>
        <!--选择商品分类的级联选择框
        :options="CateList" 展示的数据
        v-model="CateList"把选择的值放到数组中
        -->
        <el-cascader popper-class="flotage" :clearable="true" v-model="selectedCateKeys" :options="CateList" :props="CateProps" @change="handleChange"></el-cascader>
      </el-col>
    </el-row>

    <!--tab页签区域-->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
      <!--添加动态参数的面板-->
      <el-tab-pane label="动态参数" name="many">
        <!--添加参数的按钮-->
        <el-button type="primary" @click="addDialogVisible = true" :disabled="isBtnDisabled" size="mini">添加参数</el-button>
        <!--动态参数的表格-->
        <el-table :data="manyTabeDataa" border stripe>
          <!--展开行-->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <!--循环渲染tag-->
              <el-tag @close="handleClose(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">
                {{item}}
              </el-tag>
              <!--输入文本框-->
              <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
              </el-input>
              <!--添加按钮-->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 添加</el-button>
            </template>
          </el-table-column>
          <!--索引列-->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="参数名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button type="primary" size="mini" @click="showEditDialog(scope.row.attr_id)" icon="el-icon-edit">编辑</el-button>
              <el-button type="danger" size="mini" @click="removeParams(scope.row.attr_id)" icon="el-icon-delete">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
      <!--添加静态属性的的面板-->
      <el-tab-pane label="静态属性" name="only">
        <!--添加属性的按钮-->
        <el-button type="primary" @click="addDialogVisible = true" :disabled="isBtnDisabled" size="mini">添加属性</el-button>
        <!--静态参数的表格-->
        <el-table :data="onlyTableData" border stripe>
          <!--展开行-->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <!--循环渲染tag-->
              <el-tag @close="handleClose(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">
                {{item}}
              </el-tag>
              <!--输入文本框-->
              <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
              </el-input>
              <!--添加按钮-->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ 添加</el-button>
            </template>
          </el-table-column>
          <!--索引列-->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="属性名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button type="primary" size="mini" @click="showEditDialog(scope.row.attr_id)" icon="el-icon-edit">编辑</el-button>
              <el-button type="danger" size="mini" @click="removeParams(scope.row.attr_id)" icon="el-icon-delete">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
    </el-tabs>
  </el-card>
  <!--添加参数的对话框-->
  <el-dialog @close="addDialogClosed" :title="'添加'+ titleText" :visible.sync="addDialogVisible" width="50%">
    <!--添加参数的对话框-->
    <el-form ref="addFormRef" :model="addForm" :rules="addFormRules" label-width="100px">
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
      <el-button @click="addDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="addParams">确 定</el-button>
    </span>
  </el-dialog>

  <!--修改参数的对话框-->
  <el-dialog @close="editDialogClosed" :title="'修改'+ titleText" :visible.sync="editDialogVisible" width="50%">
    <!--修改参数的表单-->
    <el-form ref="editFormRef" :model="editForm" :rules="editFormRules" label-width="100px">
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
      <el-button @click="editDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="editParams">确 定</el-button>
    </span>
  </el-dialog>
</div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      //商品分类列表
      CateList: [],
      //级联选择框的配置对象
      CateProps: {
        expandTrigger: 'hover',
        value: 'cat_id', //选择的值
        label: 'cat_name', //看到的值
        children: 'children' //父子节点的嵌套值
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //被激活的页签的名称
      activeName: 'many',
      //动态参数的数据
      manyTabeDataa: [],
      //静态属性的数据
      onlyTableData: [],
      //控制添加对话框的显示和隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      //添加表单的验证对象
      addFormRules: {
        attr_name: [{
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }, ]
      },
      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //修改的表单对象
      editForm: {},
      //修改的标的验证对象
      editFormRules: {
        attr_name: [{
          required: true,
          message: '请输入参数名称',
          trigger: 'blur'
        }, ]
      },

    }
  },
  created() {
    //获取所有的商品分类
    this.getCateList()
  },
  methods: {
    getCateList() {
      this.$http.get('categories').then(res => {
        if (res.data.meta.status !== 200) {
          return this.$message.error('获取分类数据失败')
        }
        this.CateList = res.data.data
      })
    },
    //级联选择框变化 会给触发函数
    handleChange() {

      this.getParamsData()
    },
    //tab页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    //获取参数列表数据
    getParamsData() {
      //判断只能选择三级内容
      if (this.selectedCateKeys.length != 3) {
        //选择不是三级分类清空数据
        this.selectedCateKeys = []
        this.manyTabeDataa = []
        this.onlyTableData = []
        return
      }

      //证明选中的是三级分类
      console.log(this.selectedCateKeys)
      //根据所选分类的id和当前所处的面板获取对应的参数
      this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      }).then(res => {
        if (res.data.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }

        //循环出tag值 split(' ')用空格分割字符串 成为数字
        res.data.data.forEach(item => {
          //判断是否为空字符串 返回空数组
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []

          //添加一个boole值来控制输入框的显示与隐藏
          item.inputVisible = false
          //文本框输入的值
          item.inputValue = ''
        })
        console.log(res.data.data)
        if (this.activeName === 'many') {
          this.manyTabeDataa = res.data.data
        } else {
          this.onlyTableData = res.data.data
        }
      })
    },
    //监听添加对话框的关闭
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) {
          return
        }
        this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        }).then(res => {
          if (res.data.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.getParamsData()
          this.addDialogVisible = false
          return this.$message.success('添加数据成功')

        })
      })
    },
    //点击按钮，展示修改参数对话框
    showEditDialog(attr_id) {
      //查询当前参数的信息
      //需要带的参数分类id是this.cateId属性 ID是attr_id
      this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
        params: {
          attr_sel: this.activeName
        }
      }).then(res => {
        if (res.data.meta.status !== 200) {
          return this.$message.error('获取参数信息失败')
        }
        this.editForm = res.data.data
      })
      this.editDialogVisible = true
    },
    //监听修改对话框的关闭
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(valid => {
        if (!valid) {
          return
        }
        //发送修改请求
        this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName,

        }).then(res => {
          //判断请求是否成功
          if (res.data.meta.status !== 200) {
            return this.$message.error('修改参数失败')
          }
          //刷新数据
          this.getParamsData()
          //隐藏对话框
          this.editDialogVisible = false
          //弹框提示消息
          return this.$message.success('修改数据成功')
        })
      })
    },
    //根据id删除对应的参数
    removeParams(attr_id) {
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {

        this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`).then(res => {
          if (res.data.meta.status !== 200) {
            return this.$message.error('删除参数失败')
          }
        })
        this.getParamsData()
        this.$message({
          type: 'success',
          message: '删除参数成功!'
        });
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        });
      });
    },
    //文本框失去焦点 或键盘按下Enter都会触发
    handleInputConfirm(row) {
      //判断空格
      if (row.inputValue.trim() === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return则用户输入了真是数据需要处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    //将对attr_vals操作保存到数据库
    saveAttrVals(row) {
      //需要发起请求保持数据
      this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      }).then(res => {
        if (res.data.meta.status !== 200) {
          return this.$message.error('修改参数失败!')
        }
        return this.$message.success('修改参数项成功!')
      })
    },
    //点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true
      //让文本框获取焦点
      //$nextTick方法作用 就是当页面上的元素被重新渲染之后 才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });

    },
    //删除对应的参数和选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    //如果按钮需要禁用 返回true 否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 5px;
}

.input-new-tag {
  width: 150px;
}
</style>
